How to Merge PDFs with Sejda for free

Want to know how to merge PDF with Sejda? Or looking for a way to mix and alternate odd and even PDF pages after scanning?

Sejda PDF is a popular online tool that makes combining PDF files incredibly straightforward. In this guide, we will walk you through the step-by-step process of using Sejda to merge and alternate your PDFs. Furthermore, we will also introduce a powerful, secure, and limit-free desktop alternative—WPS Office—for when you are dealing with confidential business files or large documents.

Step-by-Step: How to Merge PDF with Sejda

Sejda’s Merge tools are especially useful for quick online tasks. Below is the standard merge flow, plus Sejda’s unique Alternate & Mix option for odd/even scanned pages. For a wider overview of Sejda’s PDF toolkit, see our guide to the sejda pdf editor.

Standard PDF Merging

Use this path when you simply need to combine multiple PDFs (and supported images) into one file:

1. Open Sejda Merge: Go to Sejda’s website, open All Tools, and choose Merge (or open the Merge PDF page directly).

2. Upload your files: Click Upload PDF files or drag and drop PDFs from your computer. JPG/PNG images can also be included. Cloud imports from Dropbox, Google Drive, or OneDrive are available via the upload dropdown.

3. Adjust the order: Drag files to set the merge sequence. Sort by filename if needed, or use Pages view to remove/rearrange individual pages.

4. Merge and download: Click Merge PDF files, wait for processing, then download the combined PDF.

Optional settings under More options can help polish the result—same page size, cover/title handling, bookmarks, table of contents, filename footers, or form-field handling (including flatten). If you often need locked filled forms after combining pages, a dedicated sejda pdf flatten workflow is worth knowing as well.

How to Mix and Alternate Odd and Even PDF Pages

After duplex scanning, you may end up with one PDF of odd pages and another of even pages. Sejda’s Alternate & Mix tool is designed for this exact case:

1. Open Alternate & Mix: From Sejda’s tools list, select Alternate & Mix (Mixes pages from 2 or more documents, alternating between them).

2. Upload the odd-page PDF and even-page PDF: Add both scanned files in the correct roles/order for alternation.

3. Set the alternating rule: Confirm the mix pattern so pages interleave correctly (odd → even → odd → even).

4. Generate and download: Run the task and download the recombined duplex-ready PDF in one pass.

This odd/even auto-mix flow is one of Sejda’s strongest merge-related advantages for scanned paperwork.

The Hidden Limits of Sejda Free Version

While Sejda is an excellent tool for quick, one-off tasks, its free version comes with limitations that matter for business and heavy document work:

• Limits on files: Free online use is typically capped at about 3 tasks per hour, with documents around a maximum of 50 MB or 50 pages per task.

• Privacy concerns: Files must be uploaded to cloud servers. For contracts, financial statements, HR packets, or other confidential PDFs, cloud processing always carries security trade-offs—so it is fair to ask whether is sejda safe for your compliance needs.

• Internet dependent: Large uploads can be slow, and you cannot finish the job if the connection drops.

  
  

  

  
  

  
  

What if you need to merge a massive 500-page report, or what if your PDF contains highly sensitive corporate data or personal financial records? Uploading confidential documents to online servers always carries security risks.

So, how do you merge PDF files offline without those free-web ceilings? What is the best secure, free alternative to Sejda PDF merge for large or confidential files?

If you are looking for a completely safe, local, and limit-free desktop solution, WPS Office is your best answer.

WPS Office: The Best Safe & Limit-Free Sejda Alternative

WPS Office gives you a practical desktop path to combine PDFs locally—especially when online limits, privacy, or file size become blockers.

100% Secure & Private: Local Processing

With WPS, merge tasks can run on your computer. Sensitive PDFs do not need to leave your device for a quick combine job, which reduces cloud-exposure risk for financial files, contracts, resumes, and internal reports. This local-first approach better supports personal privacy and company security expectations.

No Limits! Merge Large PDFs Free & Offline

Need how to merge PDF files offline without watching a 50 MB / 50-page free counter? In the WPS desktop client, you can combine large, long PDFs locally—often much faster than uploading giant files to a browser tool—and keep working even without an internet connection.

All-in-One Office Suite: Edit, Convert, and Manage

Sejda is primarily a focused online PDF toolkit. WPS is a full office suite. After you merge, you can stay in one place to edit PDF text, compress files, run high-fidelity OCR, and convert between PDF, Word, Excel, and PowerPoint when your workflow needs more than a one-step online merge.

Quick WPS merge path: Open WPS Office → go to PDF → choose Combine → add files → rearrange thumbnails → click Merge and save. That is a clean, ad-light desktop entry for everyday combining.

Quick Comparison: Sejda vs. WPS Office

Use this table to decide quickly based on odd/even mixing needs, privacy, size limits, editing depth, and offline use:

Free Office Download

• Use Word, Excel, and PPT for FREE, No Ads.

• Edit PDF files with the powerful PDF toolkit.

• Microsoft-like interface. Easy to learn. 100% Compatibility.

• Boost your productivity with WPS's abundant free Word, Excel, PPT, and CV templates.

Free Download

100% secure

Maira Mehtab